Greg Robinson's Blog

When the Merge or AcceptChanges methods are called on a DataSet, the DataSet notifies all the DataViews bound to it that they must reset the list they are handling and the DataView notifies this to all the bound controls.

I am seeing cases in our app where calls to CancelCurrentEdit are not Rejecting changes made by the user. I have to manually call RejectChanges on the datasource after calling CancelCurrentEdit. I assumed the call to CancelCurrentEdit would RejectChanges made to the datasource; at least that is what the docs state:

http://research.microsoft.com/Comega/

We handle the Validating Event for a textbox on a form.  Inside this event, we run some checks and throw up a Yes\No MessageBox.  Doing this causes some strange behaviors.

Keith Brown does it again:

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We are handling the Validating event for a control.  If a conditional test fails in this event handler, we set CancelEventArgs = True and call SetError on ErrorProvider :

Per this article: